"I think there are 18 million cracks in the glass ceiling that say, yes, do it. I think Hillary had something that is a bit unusual. She has a very committed woman constituency, female constituency right now. She has proved herself. She has grown in the campaign. She has some constituencies that he needs."

Rangel -- a founding member of the Congressional Black Caucus and one of the New York senator's earliest supporters -- appeared on CBS' "Face the Nation":

"From a personal view -- and I may be too close to the forest -- I think it is an absolutely unbeatable ticket, and I think it would be terrific for the country."